GRAS 46BE 1/4" CCP Free-field Standard Microphone Set

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GRAS 46BE 1/4" CCP Free-field Standard Microphone Set

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The Industry Leaders—GRAS ¼″ microphones have the lowest noise floors in their categories

The 46BE is a free-field microphone set and as such optimized for all acoustic applications, where the location of the main sound source is known and the microphone can be pointed directly at it ensuring 0° incidence. However it should be noted that the small size of the ¼″ microphone body and diaphragm also enables pressure and random-incidence (diffuse field) measurements up to 20 kHz without removing the protection grid or need for further compensation. This all-use feature is very useful if you are not able to point out the nature of your sound field.

The high cut-off frequency makes it ideal for ultra-sonic diagnostics and impulse measurements, where minimum distortion and high resolution are obtained by the small size and fast response of the diaphragm.

Regarding temperature range, see the Specifications. Should higher temperature limits be required, we recommend considering the GRAS probe microphones where the microphone and preamplifier can be isolated from the hot source.


Freq range: 4 Hz to 80 kHz
Dyn range: 35 dB(A) to 160 dB
Sensitivity: 3.6 mV/Pa
Use: For general acoustic diagnostics




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Product Overview

Why is high-frequency measurement needed?

Acoustic quality requirements for telecom, audio, PCs and tablets are ever increasing, with a constant trend towards tighter production tolerances and the need to include higher frequencies in testing. The physical properties of smaller microphones not only make them a great solution for meeting those requirements and minimizing error in the data measured on the production line, they are more easily placed on the lines, where a small footprint is critical—smaller microphones can be fitted in smaller test setups.


Is smaller better?

Interestingly, it is the actual physical size of ¼″ microphones that provides many of the benefits. The size-related properties reduce the pressure build-up effect on the diaphragm, but also significantly minimize error when when the sound wave is not 0° incidence and can inherently enable measurements at higher-frequency ranges and pressure levels. And when accounting for real-world conditions and measuring where there are many reflections and disturbances, such as in-cabin, the physical advantages of a ¼″ microphone can greatly increase accuracy and simplify post-processing data. For example, at 20 kHz, a ½″ free-field (FF) mic underrepresents the sound power of a 90° incidence wave by ca. 10 dB—a ¼″ FF mic, only by approx. 3 dB. This results in more accurate data in environments with random angles of incidence where corrections are difficult or impossible to estimate.

Product Features

  • Reduced influence of the angle of incidence.
  • Well-suited for high-frequency measurements.
  • GRAS FF (46BE) will always be within the IEC 61672 (SLM) limits no matter where the sound comes from.
  • Minimal footprint for easy placement on a production line.
  • Small diaphragms enable the possibility for testing miniature microphones, such as MEMS.
  • Reduced influence on measurement environment due to their small size.
  • Lowest noise in the industry for high sensitivity, pressure and free field.
  • Enables extreme SPL measurement.
  • Competitive pricing.